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+/**
+ * Copyright 2020 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {Protocol} from 'devtools-protocol';
+
+import {ElementHandle} from '../api/ElementHandle.js';
+import {assert} from '../util/assert.js';
+
+/**
+ * File choosers let you react to the page requesting for a file.
+ *
+ * @remarks
+ * `FileChooser` instances are returned via the {@link Page.waitForFileChooser} method.
+ *
+ * In browsers, only one file chooser can be opened at a time.
+ * All file choosers must be accepted or canceled. Not doing so will prevent
+ * subsequent file choosers from appearing.
+ *
+ * @example
+ *
+ * ```ts
+ * const [fileChooser] = await Promise.all([
+ * page.waitForFileChooser(),
+ * page.click('#upload-file-button'), // some button that triggers file selection
+ * ]);
+ * await fileChooser.accept(['/tmp/myfile.pdf']);
+ * ```
+ *
+ * @public
+ */
+export class FileChooser {
+ #element: ElementHandle<HTMLInputElement>;
+ #multiple: boolean;
+ #handled = false;
+
+ /**
+ * @internal
+ */
+ constructor(
+ element: ElementHandle<HTMLInputElement>,
+ event: Protocol.Page.FileChooserOpenedEvent
+ ) {
+ this.#element = element;
+ this.#multiple = event.mode !== 'selectSingle';
+ }
+
+ /**
+ * Whether file chooser allow for
+ * {@link https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file#attr-multiple | multiple}
+ * file selection.
+ */
+ isMultiple(): boolean {
+ return this.#multiple;
+ }
+
+ /**
+ * Accept the file chooser request with the given file paths.
+ *
+ * @remarks This will not validate whether the file paths exists. Also, if a
+ * path is relative, then it is resolved against the
+ * {@link https://nodejs.org/api/process.html#process_process_cwd | current working directory}.
+ * For locals script connecting to remote chrome environments, paths must be
+ * absolute.
+ */
+ async accept(paths: string[]): Promise<void> {
+ assert(
+ !this.#handled,
+ 'Cannot accept FileChooser which is already handled!'
+ );
+ this.#handled = true;
+ await this.#element.uploadFile(...paths);
+ }
+
+ /**
+ * Closes the file chooser without selecting any files.
+ */
+ cancel(): void {
+ assert(
+ !this.#handled,
+ 'Cannot cancel FileChooser which is already handled!'
+ );
+ this.#handled = true;
+ }
+}